We compare our AMPL with its three variants where the MIW is instead estimated by the Variational Power Method [1]}, GENeralized stationary DIstribution Correction Estimation [2]}, and Dual stationary DIstribution Correction Estimation [3]}.
Three variants are simply dubbed as VPM, GenDICE, and DualDICE.
For numerical stability, the estimated MIW from these three methods is clipped into \((10^{-8}, 500)\) .
Implementation details are provided in Appendix REF .
